client2.c

源码包中是我在学习Linux进程间通信时所写的关于五种通信方式（管道

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>

#define KEY_MSG         0x101
#define MSGSIZE         128

int main()
{
        int     msgid;
        struct  msgbuf
        {
                long    mtype;
                int     subtype;
                char    mtext[MSGSIZE];
        }bufin, bufout;

        msgid = msgget( KEY_MSG, 0666 );                /* open message queue created by server */

        if( fork() == 0 )
        {
		printf( "send message to client1 :" );
                while(1)
                {
                        fgets( bufout.mtext, MSGSIZE, stdin );
                        bufout.mtype = 1L;
                        bufout.subtype = 3;
                        msgsnd( msgid, &bufout, MSGSIZE+4, 0 );
                }
        }

        else
        {
                while(1)
                {
                        msgrcv( msgid, &bufin, MSGSIZE+4, 3L, 0 );

			if( bufin.mtext[0] == 'x' || bufin.mtext[0] == 'X' )
			{
				kill( fork(), SIGINT );
                                break;

			}	
                        printf("receive message from client1 :%s", bufin.mtext );
                }
        }
}